A device that pumps air into a fire to make it burn hotter, or deep loud sounds that a person makes from their chest.
From Old English 'belg' (bag, belly). The tool is ancient—bellows were used in metalworking by 5000 BCE. The 'loud noise' meaning comes from belly-resonating sounds.
When your diaphragm (a muscle under your lungs) contracts, it works exactly like bellows—it's why deep breathing is called 'belly breathing,' and why angry bellowing literally activates that same muscle.
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